1 character string range

event_keycode.js

var Events = Array.apply( [], Array( 90 ).reduce( function( e, v, i ) { // String.fromCharCode( 122 ) === 'z' 
    v = 33 + i;                                                         // String.fromCharCode(  33 ) === '!'
                                                                        // so 123 - 33 === 90
    e.KEY_CODE[v]            = String.fromCharCode( v );
    e.KEY_MAP[e.KEY_CODE[v]] = v;

    return e;
}, { KEY_CODE : Object.create( null ), KEY_MAP : Object.create( null ) } );

/** 

JSON.stringify( Events ) => 
{  "KEY_CODE" : {
        "33" : "!", "34" : "\"", "35" : "#", "36" : "$", "37" : "%", "38" : "&", "39" : "'", "40" : "(", "41" : ")", "42" : "*", "43" : "+", "44" : ",", "45" : "-", "46" : ".", "47" : "/", "48" : "0", "49" : "1", "50" : "2", "51" : "3", "52" : "4", "53" : "5", "54" : "6", "55" : "7", "56" : "8", "57" : "9", "58" : " :", "59" : ";", "60" : "<", "61" : "=", "62" : ">", "63" : "?", "64" : "@", "65" : "A", "66" : "B", "67" : "C", "68" : "D", "69" : "E", "70" : "F", "71" : "G", "72" : "H", "73" : "I", "74" : "J", "75" : "K", "76" : "L", "77" : "M", "78" : "N", "79" : "O", "80" : "P", "81" : "Q", "82" : "R", "83" : "S", "84" : "T", "85" : "U", "86" : "V", "87" : "W", "88" : "X", "89" : "Y", "90" : "Z", "91" : "[", "92" : "\\", "93" : "]", "94" : "^", "95" : "_", "96" : "`", "97" : "a", "98" : "b", "99" : "c", "100" : "d", "101" : "e", "102" : "f", "103" : "g", "104" : "h", "105" : "i", "106" : "j", "107" : "k", "108" : "l", "109" : "m", "110" : "n", "111" : "o", "112" : "p", "113" : "q", "114" : "r", "115" : "s", "116" : "t", "117" : "u", "118" : "v", "119" : "w", "120" : "x", "121" : "y", "122" : "z"
}, "KEY_MAP"  : {
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`" : 96, "a" : 97, "b" : 98, "c" : 99, "d" : 100, "e" : 101, "f" : 102, "g" : 103, "h" : 104, "i" : 105, "j" : 106, "k" : 107, "l" : 108, "m" : 109, "n" : 110, "o" : 111, "p" : 112, "q" : 113, "r" : 114, "s" : 115, "t" : 116, "u" : 117, "v" : 118, "w" : 119, "x" : 120, "y" : 121, "z" : 122
} }


**/

range_str.js

function range_str( from, to ) {
    var n = Math.abs( ( from = String( from ).charCodeAt( 0 ) ) - String( to ).charCodeAt( 0 ) ) + 1;

    return Array.apply( [], Array( n ) ).map( function( v, i ) { 
        return String.fromCharCode( from + i ); 
    } ); 
}

range_str( '!', 'z' ).join( ' ' ); 

/** 

returns => 
"! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z"

**/